Level.build_objects partially implemented
Added level coherency check and changed method parameters
Level objects attribute splitted into objects and toggle_objects
Level.build_objects implemented
Finished Level implementation
Fixed toggling for non-toggling objects and incorrect model initialization values in module levels
Removed model.List.append from Level.build_objects
Implemented helper function to load map ascii representation from file
Added ascii representation of level 1
Integrate Level
New Level class partially integrated. Fixed some errors.
Integrated several objects
Added Lever and Door toggling logic
Fixed bad toggle list construction in levels module
Toggling integrated in doors and levers
Avoid to search tile number each time a door is toggled
Restored main loop access to super_massive_jumbo_loop
Merge dev branch to master